Door-bolt lock.



P. W.' SMITH DOOR BOLT LOCK.-

APPLICATION FILED OCT-29, 19M.

1,1 59,877; Patented Nov. 9, 1915.

mvemtoz i IwZl Smith UNITED STATE PATENT @PPIQIZ.

PURNELL W. SMITH, OF PHILADELPHIA, PENNSYLVANIA.

DOOR-BOLT LOCK.

T 0 all whom it may concern:

Be it known that I, PURNELL W. SMITH, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented new and useful Improvements in Door-Bolt Locks, of which the following is a specification.

My invention relates to new and useful improvements in door bolt locks, and has for its object to provide an exceedingly simple and effective device of this character whereby the bolt may be locked in the keeper to prevent the accidental unlatching of said bolt.

lVith these ends in view this invention consists in the details of construction and combination of elements hereinafter set forth and then specifically designated by the claims.

In order that those skilled in the art to which this invention appertains may understand hoW to make and use the same, I will describe its construction in detail, referring by numeral to the accompanying drawing forming a part of this specification, in which Figure 1, is a front elevation of the keeper showing my improvement applied thereto. Fig. 2, is a similar view of the bolt casing showing the bolt protruding therefrom; and Fig. 3, is a longitudinal sectional view showing the parts in operative relation.

In carrying out my invention as here embodied 2 represents the bolt casing which may be of any ordinary construction, in which is slidably mounted the bolt 3 having a knob or finger hold 1, whereby said bolt may be drawn into or moved out of the casing and said knob through and works in the longitudinal slot 5 and the transverse communicating slots 6.

The outer end of the bolt 3 is provided with a beveled nose 7 and through the rear thereof intermediate, the ends of the bolt are one or more notches 8, each extending slightly more than half way around the bolt, and when two notches are used the rear wall of one notch is beveled as at 9.

10 denotes the keeper which is also of ordinary construction and is provided with an opening 11 in to which projects the extension 12 of the resilient locking member 13, the same being secured to any suitable por- Specification of Letters Patent.

Patented Nov. 9, 1915.

Application filed. October 29, 1914. Serial No. 869,313.

tion of the keeper here shown as being at tached to the flange by a screw 14: or its equivalent.

I have described the bolt casing as having transverse slots 6 in communication with the longitudinal slot 5, but these transverse slots are not necessary for when my improvement is used, it is unnecessary to turn the bolt 3, and it is also unnecessary to have more than one notch 8 except as a precaution or a measure, so that if the bolt is not inserted in the keeper the entire distance, the first notch will register with the extension of the resilient locking means, and the bolt will be held against accidental withdrawal.

In practice the device is used in the ordinary manner, and when the end of the bolt 3 is inserted in its keeper the extension 12 of the resilient locking means 13 will ride over the beveled nose 7 of said bolt, and

when said bolt has been moved a suflicient distance, said extension 12 will drop into the notch 8 and prevent the bolt from being again withdrawn from its upper until the resilient locking means 13 is raised to disengage the extension 12 from the bolt.

If the bolt 3 is provided with two notches the extension 12 will drop into the first notch and lock the bolt, although the same is entirely within the keeper, and by moving said bolt further into the keeper the extension 12 will ride over the bevel 9 and then drop into the second notch at which time the bolt will be held against accidental displacement or locked inits proper position.

In the ordinary door bolt the bolt may some times disengage from its keeper by rattling the door or window to which it is attached, caused by the position of the bolt upon the door or window, or some times by the position in which the knob 4: remains after the bolt is inserted in the keeper, but these disadvantages in the ordinary door bolt are entirely overcome by the use of my improvement, in which the end of the bolt 3 is inserted in its keeper. The extension 12 of the resilient locking means will engage the notch 8 and prevent the withdrawal of said bolt from its keeper until said extension 12 is disengaged from the notch.

Of course I do not wish to be limited to the exact details of construction as herein shown, as these may be varied within the limits of the appended claims without departing from the spirit of my invention.

" prevent its accidental Withdrawal from the keeper.

2. A door bolt comprising a casing, a bolt slidably mounted therein, said bolt having a beveled nose, and provided With a notch intermediate its ends, a keeper into Which the bolt projects, said keeper having an opening therein and a resilient locking means secured to the exterior of said keeper provided With an extension projecting through the opening into the interior of said keeper and arranged to engage the notch in the bolt to prevent the accidental Withdrawal of said bolt from said keeper.

3. A door bolt comprising a casing, a bolt slidably mounted therein and having a .notched outer end, a keeper into which the bolt projects, and resilient locking means silient locking member conforming to a por-v vt1on of the exterior of said casing, a screw for fastening one end of said locking member to the flange of said keeper, and an extension formed With the opposite or free end of said locking member adapted to project through the opening in said keeper and co-- operate With the notched end of the bolt to prevent the Withdrawal of said bolt from saidkeeperi In testimony whereof, I have hereunto afiixed my signature in the presence oftWo subscribing Witnesses.

PURNELL W. SMITH.

Witnesses MARY E. HAMER, M. TOBIAS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

' Washington, D. C. 

